doc: documentation: Update outdated file paths
doc: documentation: Update outdated file paths

This commit updates the documentation guidelines to reflect the
refactored documentation paths.

It also corrects the unnecessary escapes of the backticks.

Signed-off-by: Stephanos Ioannidis <d862a8ba07ce1656f326514118a4618b42d2d2c0@nordicsemi.no>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr